Glock G21 Gen4 .45 ACP 10-Round Magazine - Black Polymer

The Glock 74201 G21 10-round magazine delivers reliable feeding and consistent performance for .45 ACP firearms. This factory magazine maintains the same exacting standards as original equipment, ensuring seamless compatibility with Glock G21 pistols across all generations.

What Makes This Different

Glock's proprietary polymer construction resists impact damage and environmental stress better than traditional metal magazines. The witness holes allow quick visual confirmation of remaining rounds without removal from the firearm. Factory tolerances ensure consistent spring tension and follower movement that aftermarket alternatives often fail to match.

Key Features

• 10-round capacity optimized for .45 ACP cartridge dimensions
• High-impact polymer body withstands drops and extreme temperatures
• Steel-reinforced feed lips prevent deformation under repeated use
• Orange follower provides clear visual indication during loading
• Witness holes at 5 and 10-round intervals for quick capacity checks
• Drop-free design ensures reliable ejection during tactical reloads
• Compatible with all Glock G21 generations and variants

Field testing demonstrates consistent feeding across various .45 ACP loads, from 185-grain target rounds to 230-grain defensive ammunition. The magazine's geometry accommodates both ball and hollow-point projectiles without binding or jamming. Law enforcement agencies report thousands of trouble-free cycles in duty applications, while competitive shooters rely on these magazines for match-grade reliability.

Technical Specs

• Capacity: 10 rounds of .45 ACP ammunition
• Body Material: High-impact polymer construction
• Feed Lips: Steel-reinforced for durability
• Follower: Orange polymer with anti-tilt design
• Spring: Heat-treated steel with consistent tension
• Compatibility: Glock G21 all generations
• Weight: 2.8 ounces empty
• Country of Origin: Austria

Factory magazines maintain warranty coverage and ensure optimal function with Glock pistols. Professional armorer testing confirms these magazines meet the same specifications as those shipped with new firearms, making them the logical choice for replacement or backup applications.